Semiconductors are the detached class of matters. Scientists got known about such substances in the end of the 19th century, but just in the 20th century scientists managed to obtain more knowledge about them. Russian physicists performed a lot of researches. The results demonstrated that semiconductors may assist to accelerate the fluctuations and maintain them. During further years semiconductor assembly were excluded by tubes. First transistor was developed in Bell's laboratory in 1949. That event impacted on the quick development of semiconductor devices. That was the beginning of the era of semiconductor technologies.
A lot of physicists carry out a huge amount of researches simply to get more knowledge about such feature of semiconductors as stimulated radiation. First laser device was created with usage of semiconductors. The first version was based on p - n barriers, the latest ones - on heterojunction.